January 22 , 2016. EN. Nevado Del Ruiz , Kilauea , Rokatenda , Bromo .

Home / blog georges Vitton / January 22 , 2016. EN. Nevado Del Ruiz , Kilauea , Rokatenda , Bromo .

January 22 , 2016. EN. Nevado Del Ruiz , Kilauea , Rokatenda , Bromo .

January 22 , 2016.



Nevado Del Ruiz , Colombie :


Internal activity level of the Nevado del Ruiz volcano.
The level of activity continues at:
Activity level Yellow or (III): changes in the behavior of volcanic activity.

Regarding the monitoring of the activity of the Nevado del Ruiz volcano, the Colombian Geological Service reports:

During the last week, the volcanic system continued to show unstable behavior. The recorded seismic activity was mainly associated with the fracturing of the rock in the volcanic structure. This type of seismicity was located mainly in the Southwest areas, Northeast, Southeast and North distal Arenas crater. The depths of earthquakes during the week were between 1.3 and 7.9 kilometers. The maximum recorded was magnitude 3.2 ml (local magnitude), corresponding to an earthquake on January 18 at 3:05 (local time), located in the southwest area of ​​Arenas crater at a depth of 2.1 km.


Enormous plume from the crater Arenas of the volcano Nevado del Ruiz
The height of the plume is estimated at two kilometers. The picture also shows the great loss of ice on top of the mountain.
Image captured exclusively by the RCN Air Patrol. Seismic activity in the last weeks on the volcano was persistent and alert level 3 is maintained.

As for seismic activity related to fluid dynamics in volcanic pipes, this type of seismicity was characterized by the appearance of continuous tremors and earthquakes long period (LP). These two types of signals were mainly located near the Arenas crater and areas in South and Southeast of the volcano. The continuous tremor signal had varying levels and low energy. Do not rule out that new episodes of high levels of energy of the signal and the output of gas and ash in the atmosphere may occur.
These processes were accompanied by thermal anomalies, which were recorded by monitoring satellite images provided by different organizations, such as the Italian universities of Turin and Florence (Mírová portal). These moderate temperature anomalies were recorded on 13, 16 and 18 January, and have been identified near the Arenas crater, confirming the instability of the Nevado del Ruiz volcano and confirming that the process continues to evolve.


The summit of Nevado del Ruiz, compared with the photo above. We realize the thickness of ash deposits that covered all glaciers summital


The volcanic deformation measured from electronic inclinometers, global navigation satellite systems (GNSS) and satellite images, which record changes in tilt, position and shape of the volcano (respectively) in the last evaluated period, showed no significant changes.
The volcano continues to emit into the atmosphere large amounts of water vapor and gases, including sulfur dioxide (SO2), as has been estimated by the SCAN DOAS permanent stations installed in the volcano area and satellite imagery.
The column of gas, steam and ash reached a height of 650 meters above the summit of the volcano on January 14. The direction of the dispersion of the column is in line with the regime of prevailing winds in the region, who, during the week showed a predominant direction towards the west and northwest of the volcano.

 Source : SGC


Kilauea , Hawai :

19°25’16 » N 155°17’13 » W,
Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Activity Summary:
Eruptive activity continues at Kilauea Volcano’s summit and East Rift Zone. Seismicity and deformation rates throughout the volcano remain at background levels. Scattered lava flow activity continues on the June 27th lava flow field within about 6 km (4 mi) northeast of Pu’u ‘O’o. These flows currently pose no threat to nearby communities.




This photograph was taken from the western pit at Puʻu ʻŌʻō, and shows the small lava pond (roughly 20 m in diameter) contained within the pit


Summit Observations:
The lava lake remains active within the Halema’uma’u Overlook crater. The lake height fluctuated slightly over the past day due to changes in spattering, remaining at approximately 39 m (128 ft) below the crater rim this morning. No significant change in tilt was observed at summit tiltmeters over the past day. Seismicity is within normal, background rates with tremor fluctuations associated with lava lake spattering. For the period December 30, 2015 – January 5, 2016, the summit sulfur dioxide emission rate averaged 6,200 metric tons/day.



Incandescence was visible in the small pit that formed recently on the upper northeast flank of Pu’u ‘O’o.

Pu’u ‘O’o Observations:
Webcam images over the past 24 hours show persistent glow at long-term sources within the crater and high on the northeast flank of the cone. The HVO field crew working at the cone on 1/19 reported continued activity at established vents within the crater. Seismic activity remains low at Pu’u ‘O’o. A tiltmeter on the cone recorded no significant tilt change over the past day. The sulfur dioxide emission rate from all East Rift Zone vents was about 270 metric tons/day when it was last measured on January 4.




Viewing conditions into Pu’u ‘O’o Crater were exceptional today, providing clear views of the crater floor. This view is towards the northwest. The inner, deeper crater formed in mid-2014 following the opening of the June 27th vent, and occasional small flows on the crater floor are evident by their dark color. The smaller, circular pit in the west portion of the crater has contained a small, active lava pond in recent months. Very little of the original cone, formed in the early part of the Pu’u ‘O’o eruption in the mid-1980s, remains visible on the surface. The tan colored area in the foreground, and the brown sections of the crater rim in the upper part of the photograph, are the original portions of the cone and consist of cinder and scoria.


June 27th Lava Flow Observations:
Webcam images show continued surface flow activity on the June 27th flow field, with smoke plumes where lava is igniting forest. Yesterday’s HVO field crew verified that active flows are within about 6 km (4 mi) northeast of Pu’u ‘O’o and are not currently threatening any nearby communities.


Source : HVO



Rokatenda, Indonésie:

8.32 ° S, 121.708 ° E
Altitude 875 m

The PVMBG  reported that observers in an observation from thepost at Kampung Ropa, Keliwumbu Village, noted that during the period from 30 December 2015 to 13 January 2016, diffuse white plumes rose and amounted to 150 m above the Paluweh. Seismicity remained relatively stable, and was characterized by deep and shallow volcanic earthquakes, and signals indicating emissions and avalanches. The alert level remained at 2 (on a 1-4 scale). It reminded at residents and tourists not to approach the summit within 1.5 km.



Paluweh volcano, also known as Rokatenda, forms the 8-km-wide island of Paluweh north of the volcanic arc that cuts across Flores Island. Although the volcano rises about 3000 m above the sea floor, its summit reaches only 875 m above sea level. The broad irregular summit region contains overlapping craters up to 900 m wide and several lava domes. Several flank vents occur along a NW-trending fissure. The largest historical eruption occurred in 1928, when strong explosive activity was accompanied by landslide-induced tsunamis and lava dome emplacement.

Sources : PVMBG, GVP .

Photo : Georges Vitton


Bromo, Indonesie :

Suite of the news from Bromo, through our correspondents in the field:

Not much new to Bromo yesterday. The activity is regular (according observatory and seismograms). Always a pretty clear panache with by moment louds emission columns!
The observations are mostly in the morning in good weather. Rain showers in the afternoon (small lahars sources or small floods in the caldera The ravinage is underway!)


Note that the Semeru seems active with several plumes some of which very gray that go up high enough (little wind!)
We also see in the distance a small plume above Raung (not regularly observed only once!)

In fact this evening there was a big phase of a very heavy plume for at least one or two hours, but the observation was difficult because of the clouds and rain! (Then the arrival of the night!).

The seismic data obtained showed sharp spikes, which depicted eruptions and quakes. The volcano is still experiencing tremors with maximum amplitudes of 2-17 millimeters. The PGA also recorded 62 eruptions with maximum amplitudes of 16-36 millimeters with earthquakes lasting between 10 and 53 seconds.

Apparently Tom Pfeiffer confirms the activity of Raung view by Sylvain. He said the new ash cone has two main vents; the smallest at the SW produced intermittent, sometimes continuous jets of ash.


Source : Sylvain Chermette / 80 jours voyage .

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